Advanced Materials Research Vols. 396-398

Abstract: Many vessels capsized in the passed few years when carry nickel ore, this make many shipowners and crewmembers fear to carry nickel ore . This paper based on the special properties of nickel ore, analysis the root cause why nickel ore are easy to liquefaction when carried on board, demonstrated nickel ore's liquefaction produce large amount of free surface and make vessel loss stability and cause harmful to vessels and crewmembers, summarized additional difficulty vessel encountered when carry nickel ore, based the requirements from IMSBC Code point out the key point of safe transport nickel ore is keep its moisture content below TMP, also represent some useful precautions on nickel ore safe shipment.

Abstract: In this paper, the TCF short-sequence bleaching (OQPaP) of pinus kesiya pulp from low-temperature kraft pulping with kappa number of 21.32 and viscosity of 1194mL•g^-1 (the maximum pulping temperature was only 150°C) was optimized. Under the optimum bleaching condition, the bleached pulp properties of low-temperature kraft pulp were as follows: yield 93.1%, brightness 85.31% ISO, kappa number 1.02, viscosity 751mL•g^-1 and PC number 0.28. And physical properties of handsheet (after beating to 45oSR) were as follows: breaking length 5.41km, bursting index 3.48kPa•m²•g^-1, tearing index 8.4mN•m²•g-1, and folding endurance 146 times.

Abstract: Different chitosan carboxylic salts were successfully prepared via a simple way using chitosan and oxalic, fumaric, salicylic acid for the first time. The characterizations of the salts were evaluated by FT-IR, 13C NMR, 1H NMR, elemental analysis, XRD. The solution properties and moisture absorption-retention abilities of the salts were compared with chitosan. The result indicated that chitosan and carboxylic acid were combined with salt bond. The properties of the salts were related to the type of carboxylic acid added and the formation of salt bond. The water-solubility, wetting effect and moisture-retention absorption abilities of the salts were better than chitosan. They therefore have the potential to substitute for chitosan for easy use as coating in food preservation.

Abstract: A new composite magnetic chitosan coated cotton (MSCC) fiber with 3-glycidyloxypropyltrimethoxysilane (GPTMS) as a crosslinking agent was prepared for the adsorption of C.I. Reactive red 194 from aqueous solution. The structure and morphology of MSCC fibers were analyzed by FTIR and SEM. The adsorption behavior of C.I. Reactive red 194 from aqueous solution onto MSCC fibers was investigated under various experimental conditions such as initial concentration of the dyes, temperature, pH and adsorb time. Experimental data indicated that the adsorption capacity of MSCC fibers on C.I. Reactive red 194 was higher in acidic rather than in basic solutions. A rise of temperature accelerates mass transfer of dyes into the MSCC fibers. The kinetics of the interactions was best described by pseudo-second-order mechanism.

Abstract: A new kind of bowl-shaped liquid crystals were designed and synthesized by esterification. They used a calix[6]arene as central unit and ω- cholesteric alkyl diacid monoester as mesogenic arms. Their chemical structures were confirmed by FTIR and 1HNMR spectra, their mesomorphic properties and phase behavior were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-Ray Diffraction (XRD) measurements. The results showed that the kind of calix[6]arene bowl-shaped liquid crystals N1-N3 exhibited broad range liquid crystalline phases at moderate temperature, and they displayed cholesteric phase focal-conic texture in liquid crystal states. With increasing the flexibility of monomers M1-M3, the melting point and the clearing temperature decreased in the macromolecules.

Abstract: Combined with the structural dynamic model of a car set up with the substructure modal synthesis method, body panels acoustic contribution was analyzed to reduce the in-car structural noise in low frequency range. The driver-right-ear position was selected as acoustic response point, with the operational vibration response of the dynamic model as boundary condition for acoustic BEM (boundary element model), the panels that attribute most to the in-car noise were located according to ATV (acoustic transfer vector) results. After the vibrational restraint of the crucial panels by corresponding experimental measurement, in idling, the most decrease of main peaks is 5.7dB; the overall level of in-car noise is reduced by 3.89dB. It indicates that the substructure mode synthesis method can provide proper suggestion for optimizing in-car structural noise.

Abstract: The characteristic of the stress and strain distribution of rock landslide are simulated by ANSYS finite element software, while its variation and distribution of plastic zone are analyzed by shear strength reduction method at the same time, which are used to search out the most dangerous slip surface. Calculation results show that: (1)Geotechnical landslide along the interface has decline; the stress increases by the depth of the slope and presents the layered distribution in the X, Y directions. (2)According to the contours of the plastic strain, the plastic strain contour ridge is the most dangerous slip surface. (3)Safety coefficients are offered by calculating the non-convergence, the maximum horizontal displacement and horizontal displacement of feature point mutation in slope failure criterion, to provide the basis for the landslide hazard warning.

Abstract: A new unsymmetrical diarylethene derivative 1-(2,4-dimethyl-isoxazol-3-yl)-2-(2-methyl-5-formyl-3-thienyl) perfluoroyclopentene (1a) was synthesized. Its photochromic and fluorescent properties were investigated, respectively. The results showed that this diarylethene exhibited reversible photochromism, the ring-closed isomer absorption maxima were observed at 519 nm and 527 nm in hexane and PMMA film, respectively. In hexane solution, diarylethene 1 showed good fluorecence switching characters with 309 nm light excited.

Abstract: Four N-alkyl-pyridinium-based ionic liquids, N-ethyl-pyridinium hexafluorophosphate, N-butyl-pyridinium hexafluorophosphate,4-methyl-1-ethyl-pyridinium hexafluorophosphate，and 4-methyl-1- butyl -pyridinium hexafluorophosphate were synthetized by microwave method . The simulated gasoline was prepared by mixing n-hexane, n-heptane,toluene and thiophene. Effect of extraction temperature, the ratio of solvents and diverse ionic liquids are investigated with extraction equilibrium experiment. The best conditions of transport desulfurization are discussed. The result showed that the partition ratio of [MBPy]PF₆ to the thiophene could exceed 1.3 at temperature 45°C , the ionic liquid composition in raffinates was undetectable, [MBPy]PF6 has the best effect on the selective removal of sulfur-cont_{Subscript text}aining compounds from gasoline among these ionic liquids. When temperature is 50°C and desulfurization agent to fuel oil is 1:1, the extraction efficiency can reach over 90% only three-step extraction for gasoline.

Abstract: Protonation constants of pyrocatechol, pyrogallol and gallic acid, and stability constants, thermodynamic properties of their complexes with tetravalent vanadium VO2+ have been calculated by using pH-potentiometry at different temperatures and ionic strength of 0.1mol•L-1NaCl. The results indicated protonation constants and stability constants decrease with increasing temperature. Higher temperature is unfavorable to the complexation reactions. This kind of reaction is exothermic reaction that was spontaneous. Compared with all thermodynamic properties, the enthalpy change is the driving force for the reaction.